physics 2
How much higher will mercury stand in the open arm in a J-Tube manometer, if air column in the closed arm is reduced to 4 cm, the mercury id at the same level in both open and closed arms when the air column in the closed arm is 15 cm long. Assume barometric pressure, 1 atm.December 4, 2016

Math
The sums of n terms of two arithmetic series are in ratio of 2n+1:2n-1. Find the ratio of their 10th terms.November 25, 2016

Physics
a piano string has a length of 2m and a density of 8,000kg/m3. when the tension in the string produces a strain of 1%, the fundamental note obtained is 170 Hz. calculate the modulus of elasticity for the material of the string.October 18, 2016

math
Every Saturday,mother and Claire go to the market.On each marketing day,they spend 3 hours including the travel time.What fraction of the day is used in marketing every Saturday?October 10, 2016

Trigonometry
a) The ship left the port and sailed for 2 hours on a course of 75 degrees,at an average speed of 2.5 nautical miles per hour. b) It changed its course to 165 degrees and travelled for 3 hours, at an average speed of 4 nautical miles per hour. Your team is tasked to lead the ...September 23, 2016

Trigonometry
a) The ship left the port and sailed for 2 hours on a course of 75O, at an average speed of 2.5 nautical miles per hour. b) North It changed its course to 165O and travelled for 3 hours, at an average speed of 4 nautical miles per hour. Your team is tasked to lead the rescue. ...September 23, 2016

Math
Ali has 4 mangoes,Joe has 3 how many more mangoes does Ali haveMay 11, 2016

math
An elastic spherical ballon is being blown up so that the radius is increasing at a rate of 1cm/sec. Calculate the rate at which the volume of the ballon is increasing when the radius is 5cmApril 21, 2016

PHYSICS
A UNIFORM METER RULE IS PIVOTED AT P IN 80cm mark on the meter rule force 0.2 And 0.8N Are Applied At M The 60Cm Mark And Q The 90Cm Mark.If The Rule Is In Equilibrium .Find The Mass Of The Rule.Take g=10ms-2January 27, 2016

PHYSICS
A BODY OF 50N Rest On A Smooth Plane Incline At 30 Degree To The Horizontal Which Force Applied Parallel To The Plane Will Keep The Body In EquilibriumJanuary 27, 2016

PHYSICS
A BLOCK OF WOOD REST ON AN INCLINE PLANE AND THE COEFFICIENT OF FRICTION BETWEEN THE BLOCK AND THE PLANE IS KNOWN TO BE 0.31 At What Angle Must The Plane Be Inclined To The Horizontal So That The Block Begins To Move Down The PlaneJanuary 27, 2016

PHYSICS
A CAR TRAVELLING AT 30M/S Overcome A FrictionAlly Resistance Of 100N While Moving.What Is The Power Of The Engine(Take 1 Hp=3/4 Kw)January 27, 2016

math
45% of a class are girls if these are 40 chidren in the class how many are boys?January 20, 2016

Physics
The truck of a passenger car applies brakes at a velocity of 30 m/s and comes to rest 5 seconds later. What is the deceleration?November 23, 2015

Physics
how long does it take a car to change its velocity from 15m/s to 25m/s if it accelerates uniformly at 5m/s2.November 23, 2015

math
cross multiply and you will get something like this 2.5 X x = 0.5 X 1.25 which the answer will be 2.5x = 0.625 because we are finding for x so divide both sides by 2.5 so that x can stand alone. so 0.5x over(divided by) 2.5 and 0.625 over(divided by) 2.5. (note: we are finding...November 23, 2015

physics
A 40 N force is applied at an angle of 30o to the horizontal to pull a 6 kg box along the floor. If the coefficient of friction between the box and floor is 0.3.The box initially at rest moves a horizontal distance of 5m. What is the speed of the box when it reaches 5m? No ...November 8, 2015

physics
a mass of 15kg was suspended from a ceiling is pulled aside with a horizontal force,F, calculate the value of tension, T. (g=10m/s)September 27, 2015

St.Peter's Boys Senior High School
In a class of 500 students,60 study geography,40 study English,30 study geography and history,25 study English and history,if 10 study all the three subjects,find using venn diagram the number of students who study none of the three subjects.August 24, 2015

Augusco
The speed of a car weighing 1500kg increase from 40m/s to 50m/s.calculate the change in its momentumAugust 18, 2015

science
If the half life- period of a radioactive element is 1600.After how many years will if remains 25% of his quantityApril 11, 2015

physics
dahnay carried a box (5,4)m.the box had a mass of 5kg.dahnay says that over 300J of work was done on the box . is dahnay correct?explain the answer.March 16, 2015

physics
When one mole of C6H6 is burned, 3.27 MJ of heat is produced. When the heat from burning 7.87 g of C6H6 is added to 5.69 kg of water at 21.0°C, what is the final temperature of the water?February 15, 2015

math
Francine can read 24 pages in 30 minutes.How can you mentally calculate the number of pages she can read in 45 minutesFebruary 5, 2015

Algebra
Each day, a lion in South Africa spends 1/6 of the day watching gnus and 1/4 hours chasing gnus. Then the lion takes 4 times as much time consuming the gnus as chasing the gnus. What is the number of minutes that a lion spends a day watching, chasing and consuming gnus?September 22, 2013

Math
Old McDonald has cows and chickens on his farm. If the animals on his farm have a total of 197 heads and 634 legs, how many cows does Old McDonald have? Note: A cow has 1 head and 4 legs. A chicken has 1 head and 2 legs.September 22, 2013

Math
Explain how to find 14 x 19 by breaking apart the factors in tens and ones and finding the sum of the four partsJanuary 21, 2013

Math
Draw the graph of the following function on the given interval. [4 marks] y=1.8cos⁡(2x+〖30〗^o ) -〖180〗^o≤x<〖180〗^o 4. Draw the graph of the following function on the given interval. [4 marks] y=1.8cos⁡(2x+〖...January 21, 2013

Math
2. A propeller on a gas turbine rotates 64° every 2.70 minutes. What is the angular velocity in rev/s? What is the linear speed of a point at the tip of the blade if the diameter of the blade is 5.37 ft?January 21, 2013

Math
1. Find the area of a segment of height 22.1 inches in a circle of radius 6.42 ft. Draw a rough sketch of a circle showing the height and radius. Consider significant digits.January 21, 2013

Maths
Jasons credit cards beginning unpaid balance for August is $2,000. During the August billing cycle he made a payment of $200 and used card to purchase $50 worth of grocery. Credit card charges 24% annual percentage rate and uses the unpaid balance method. a. What ...September 20, 2011

advance algebra
i think of 3 positive numbers. the greatest number is twice a perfect square. the least of them is 1 less than half the greatest number. the average of the 3 numbers is 12.January 19, 2011

Physics
Earth has a mass of 5.97x10^24kg and a radius of 6.38x10^6m. Find the wight of a 65.0kg person on the surface of the earth and 1000km above the surface of earth?January 11, 2011

Chemistry
oh, i'm sorry, i was not able to see your answer on my previous question right away. i was posting my questions first, hoping to have answers right a away even with just one of my posts. i'm sorry. and thank you, i'm now using what you told me. :)December 9, 2010

Chemistry
a 15.00mL sample of NaOH was titrated to the stoichiometric point with 17.40mL of 0.2340M HCl. a) what is the molar concentration of the NaOH solution? b)calculate the grams of NaOH in the solution.December 9, 2010

Chemistry
thank you. i'm just confused what to use to find the number of moles, when there's mass and other given. thanks for the help.December 9, 2010

Chemistry
oh, you used the molarity to get the mole.. but i don't know what will i do with the 500mg and how to relate (3)and(4) to get the mass of NaHCO3.December 9, 2010

Chemistry
i didn't round it off, because in our class we have a rule that we should not round off until we get the final answer. NaHCO3 + HCl -> NaCl + H2O + o2 0.040 L / 0.120 mole L = 0.33..December 9, 2010

Chemistry
i got 0.01371516348 moles of HCl and then the molecular mass of NaHCO3 is 84.008.. how am i going to use these 2 to find the mass of NaHCO3? (sorry, i'm just confused)December 9, 2010

Chemistry
How many milligrams of NaHCO3 are in a 500mg tablet if 40.0 mL of 0.120M HCL is required to neutralize the sample?December 9, 2010

Chemistry
How to find the molarity of NaOH when the given is 0.1803 grams of KHPg/mol molecular w. of KHP is 204.2 9.7 ml NaOHDecember 9, 2010

Western Civilization to 1648
1. Discuss how Alexander the Great created an empire in which Greek civilization flourished in the midst of many diverse cultures. 2.Discuss how the Greek city state developed in the farmework of larger word dominated by Persia. 3. Discuss the political, social, and ...April 18, 2010

intermediate algebra
Let l = measure of the parallel side of the highway in meters w = measure of the perpendicular side of the highway in meters l + w = 3000 l = 3000 - w length = 3000 - w width = w A= lw **since we will only use 1 side of the length, we will use: A= [(3000-w)/2]w 0r w[(3000-w)/2...March 8, 2010

math
how do you find the diameter of a circle if you don't have the radius? the circumference is 628 cm. Divide the circumference by pi, which is 3.14 (approximately). That will give you the diameter. Circumference = pi * DFebruary 15, 2007

topics wrting in english
. in one of the periodic publications of the country, whose language is studied, you read article about the liquidation of zoos in the large cities. You converse with your friends: 1) describe to them about that read, say, what the title of article was; 2) express your opinion...December 31, 2006